Hello, Please have a look at the transcript below. GHC happily compiles the file with the Makefile, while GHCi chokes on it. I would be grateful for any insight into the problem. Feri. tba:~/haskell/xml/ $ cat xml2wiki.hs import System import XmlInput import XmlTree import XmlState getLength :: String -> XState () Int getLength file = do [xmlTree] <- getXmlContents $ newDocument file io $ putStr $ show xmlTree return 14 main :: IO () main = do [xmlFile] <- getArgs l <- run' $ getLength xmlFile putStrLn (show l) ---------------------------------------------------------------------- tba:~/haskell/xml/ $ cat Makefile HXT := $(HOME)/haskell/xml/HXmlToolbox-3.01 INCLUDES := $(HXT)/hdom:$(HXT)/hparser:$(HXT)/http:$(HXT)/popen:$(HXT)/parsec:$(HOME)/haskell/HTTP PACKAGES := -package util -package net xml2wiki: xml2wiki.hs ghc -o $@ --make -i$(INCLUDES) $(PACKAGES) $< ---------------------------------------------------------------------- tba:~/haskell/xml/ $ cat .ghci :set -package net -package util :set -i/home/wferi/haskell/xml/HXmlToolbox-3.01/hdom:/home/wferi/haskell/xml/HXmlToolbox-3.01/hparser:/home/wferi/haskell/xml/HXmlToolbox-3.01/http:/home/wferi/haskell/xml/HXmlToolbox-3.01/popen:/home/wferi/haskell/xml/HXmlToolbox-3.01/parsec:/home/wferi/haskell/HTTP ---------------------------------------------------------------------- tba:~/haskell/xml/ $ ghci xml2wiki ___ ___ _ / _ \ /\ /\/ __(_) / /_\// /_/ / / | | GHC Interactive, version 6.2, for Haskell 98. / /_\\/ __ / /___| | http://www.haskell.org/ghc/ \____/\/ /_/\____/|_| Type :? for help. Loading package base ... linking ... done. Loading package lang ... linking ... done. Loading package concurrent ... linking ... done. Loading package QuickCheck ... linking ... done. Loading package readline ... linking ... done. Loading package unix ... linking ... done. Loading package posix ... linking ... done. Loading package util ... linking ... done. Loading package network ... linking ... done. Loading package net ... linking ... done. Skipping Zord64_HARD ( /home/wferi/haskell/HTTP/Zord64_HARD.lhs, /home/wferi/haskell/HTTP/Zord64_HARD.o ) Skipping ParsecPos ( /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/ParsecPos.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/ParsecPos.o ) Skipping ParsecError ( /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/ParsecError.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/ParsecError.o ) Skipping ParsecPrim ( /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/ParsecPrim.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/ParsecPrim.o ) Skipping ParsecChar ( /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/ParsecChar.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/ParsecChar.o ) Skipping ParsecCombinator ( /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/ParsecCombinator.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/ParsecCombinator.o ) Skipping Base64 ( /home/wferi/haskell/xml/HXmlToolbox-3.01/http/Base64.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/http/Base64.o ) Skipping MD5 ( /home/wferi/haskell/HTTP/MD5.lhs, /home/wferi/haskell/HTTP/MD5.o ) Skipping AssocList ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/AssocList.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/AssocList.o ) Skipping NTree ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/NTree.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/NTree.o ) Skipping Util ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/Util.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/Util.o ) Skipping Unicode ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hparser/Unicode.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hparser/Unicode.o ) Skipping Parsec ( /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/Parsec.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/parsec/Parsec.o ) Skipping XmlCharParser ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hparser/XmlCharParser.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hparser/XmlCharParser.o ) Skipping POpen ( /home/wferi/haskell/xml/HXmlToolbox-3.01/popen/POpen.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/popen/POpen.o ) Skipping HTTP ( /home/wferi/haskell/xml/HXmlToolbox-3.01/http/HTTP.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/http/HTTP.o ) Skipping Browser ( /home/wferi/haskell/xml/HXmlToolbox-3.01/http/Browser.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/http/Browser.o ) Skipping XmlTreeTypes ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlTreeTypes.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlTreeTypes.o ) Skipping XmlKeywords ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlKeywords.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlKeywords.o ) Skipping XmlTreeFunctions ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlTreeFunctions.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlTreeFunctions.o ) Skipping XmlTreeFilter ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlTreeFilter.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlTreeFilter.o ) Skipping MonadStateIO ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/MonadStateIO.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/MonadStateIO.o ) Skipping XmlTree ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlTree.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlTree.o ) Skipping XmlState ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlState.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/XmlState.o ) Skipping FormatXmlTree ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/FormatXmlTree.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hdom/FormatXmlTree.o ) Skipping XmlOutput ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hparser/XmlOutput.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hparser/XmlOutput.o ) Skipping XmlParser ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hparser/XmlParser.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hparser/XmlParser.o ) Skipping XmlInput ( /home/wferi/haskell/xml/HXmlToolbox-3.01/hparser/XmlInput.hs, /home/wferi/haskell/xml/HXmlToolbox-3.01/hparser/XmlInput.o ) Compiling Main ( xml2wiki.hs, interpreted ) Ok, modules loaded: Main, XmlInput, XmlParser, XmlOutput, FormatXmlTree, XmlState, XmlTree, MonadStateIO, XmlTreeFilter, XmlTreeFunctions, XmlKeywords, XmlTreeTypes, Browser, HTTP, POpen, XmlCharParser, Parsec, Unicode, Util, NTree, AssocList, MD5, Base64, ParsecCombinator, ParsecChar, ParsecPrim, ParsecError, ParsecPos, Zord64_HARD. *Main> run' $ getLength "texi2/lilypond.xml" Loading package haskell98 ... linking ... done. GHCi runtime linker: fatal error: I found a duplicate definition for symbol __stginit_POpen whilst processing object file /home/wferi/haskell/xml/HXmlToolbox-3.01/popen/POpen.o This could be caused by: * Loading two different object files which export the same symbol * Specifying the same object file twice on the GHCi command line * An incorrect `package.conf' entry, causing some object to be loaded twice. GHCi cannot safely continue in this situation. Exiting now. Sorry.